If it helps, we are about to break ground on our 20x40 rectangle and I went 12ft on the shallow end, 10ft off the back side, 8ft on the diving board end, and 8ft on the end closest to the house. That way, we feasibly have 3 areas we can set up chairs and still have room to walk. That gives us the ability to move things around, depending on the sun. I may even add 2ft to the side closest to the house and make it 10ft also.....if we have room after the pool is in.
And Go Dawgs! Live right outside Athens, and my wife and I both graduated from UGA. Definitely put the Dawg stamp in the concrete! I didn't think about that before, and now I'm going to be looking for a template to stamp into the wet concrete when it's poured.